Abby Throws a Ball Straight Up and Times It

Multiple Choice

Abby throws a ball straight up and times it.She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s.What was the speed of the ball at as it passed the top of the flagpole? Neglect air resistance.

A) 6.4 m/s
B) 16 m/s
C) 18 m/s
D) 29 m/s
E) 33 m/s